Add filter button show/hide unread feeds. Issue #1311

iOS/AppAssets.swift

@@ -89,6 +89,14 @@ struct AppAssets {
 		return RSImage(named: "faviconTemplateImage")!
 	}()
 	
+	static var filterInactiveImage: UIImage = {
+		UIImage(systemName: "line.horizontal.3.decrease.circle")!
+	}()
+	
+	static var filterActiveImage: UIImage = {
+		UIImage(systemName: "line.horizontal.3.decrease.circle.fill")!
+	}()
+	
 	static var fullScreenBackgroundColor: UIColor = {
 		return UIColor(named: "fullScreenBackgroundColor")!
 	}()

iOS/Base.lproj/Main.storyboard

@@ -214,9 +214,17 @@
                                 <action selector="settings:" destination="7bK-jq-Zjz" id="Y8a-lz-Im7"/>
                             </connections>
                         </barButtonItem>
+                        <barButtonItem key="rightBarButtonItem" image="line.horizontal.3.decrease.circle" catalog="system" id="ZJu-oJ-c1R">
+                            <connections>
+                                <action selector="toggleFilter:" destination="7bK-jq-Zjz" id="7lh-Bz-nfD"/>
+                            </connections>
+                        </barButtonItem>
                     </navigationItem>
                     <simulatedNavigationBarMetrics key="simulatedTopBarMetrics" prompted="NO"/>
                     <simulatedToolbarMetrics key="simulatedBottomBarMetrics"/>
+                    <connections>
+                        <outlet property="filterButton" destination="ZJu-oJ-c1R" id="jiO-wg-qrG"/>
+                    </connections>
                 </tableViewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="Rux-fX-hf1" sceneMemberID="firstResponder"/>
             </objects>
@@ -289,6 +297,7 @@
         <image name="chevron.up" catalog="system" width="64" height="36"/>
         <image name="circle" catalog="system" width="64" height="60"/>
         <image name="gear" catalog="system" width="64" height="58"/>
+        <image name="line.horizontal.3.decrease.circle" catalog="system" width="64" height="60"/>
         <image name="multiply.circle.fill" catalog="system" width="64" height="60"/>
         <image name="square.and.arrow.up" catalog="system" width="56" height="64"/>
         <image name="square.and.arrow.up.fill" catalog="system" width="56" height="64"/>

iOS/MasterFeed/MasterFeedViewController.swift

@@ -14,6 +14,7 @@ import RSTree
 
 class MasterFeedViewController: UITableViewController, UndoableCommandRunner {
 
+	@IBOutlet weak var filterButton: UIBarButtonItem!
 	private var refreshProgressView: RefreshProgressView?
 	private var addNewItemButton: UIBarButtonItem!
 	
@@ -370,6 +371,16 @@ class MasterFeedViewController: UITableViewController, UndoableCommandRunner {
 		coordinator.showSettings()
 	}
 	
+	@IBAction func toggleFilter(_ sender: Any) {
+		if coordinator.isUnreadFeedsFiltered {
+			filterButton.image = AppAssets.filterInactiveImage
+			coordinator.showAllFeeds()
+		} else {
+			filterButton.image = AppAssets.filterActiveImage
+			coordinator.hideUnreadFeeds()
+		}
+	}
+	
 	@IBAction func add(_ sender: UIBarButtonItem) {
 		coordinator.showAdd(.feed)
 	}

iOS/SceneCoordinator.swift

@@ -112,6 +112,10 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
 		return panelMode == .three
 	}
 	
+	var isUnreadFeedsFiltered: Bool {
+		return treeControllerDelegate.isUnreadFiltered
+	}
+	
 	var rootNode: Node {
 		return treeController.rootNode
 	}
@@ -484,6 +488,16 @@ class SceneCoordinator: NSObject, UndoableCommandRunner, UnreadCountProvider {
 		}
 		return 0
 	}
+	
+	func showAllFeeds() {
+		treeControllerDelegate.isUnreadFiltered = false
+		rebuildBackingStores()
+	}
+	
+	func hideUnreadFeeds() {
+		treeControllerDelegate.isUnreadFiltered = true
+		rebuildBackingStores()
+	}
 		
 	func expand(_ node: Node) {
 		node.isExpanded = true